Hello @hopethereisnothing, I wish I would have had your awareness and asked this question when I was your age. My last HbA1c was also 5.8 and I really did not want to go on any more medications so I decided to exercise more and eat healthier but I was like a yo-yo with my weight until a few years ago when I found intermittent fasting which along with lowering the amount of carbs I eat has enabled me to maintain my weight loss. You might find the following discussion helpful:

--- Low-carb healthy fat living. Intermittent fasting. What’s your why?
https://connect.mayoclinic.org/discussion/low-carb-healthy-fat-living-intermittent-fasting-whats-your-why/
Along my journey I also found this video by Dr. Jay Wortman helpful and may provide some answers to your question - Dr Jay Wortman Diabetes Remission is Surprisingly Simple!